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David Smith
Kopex,rothenberg and monument last about one year for me. But a couple of years ago I started using Sabre from The Range, every bit as good, solid sturdy and only £6. Sadly I've only ever seen 15mm though but I love them. I can have three or four for they price of one of the above and works and last just as good. Cheap ones are mostly crap but Sabre are deffo a worthy competitor.